
"""
High level status display commands
"""

from collections import defaultdict
from prettytable import PrettyTable
import errno
import fnmatch
import mgr_util
import prettytable
import six
import json

from mgr_module import MgrModule


class Module(MgrModule):
    COMMANDS = [
        {
            "cmd": "fs status "
                   "name=fs,type=CephString,req=false",
            "desc": "Show the status of a CephFS filesystem",
            "perm": "r"
        },
        {
            "cmd": "osd status "
                   "name=bucket,type=CephString,req=false",
            "desc": "Show the status of OSDs within a bucket, or all",
            "perm": "r"
        },
    ]

        
    def get_latest(self, daemon_type, daemon_name, stat):
        data = self.get_counter(daemon_type, daemon_name, stat)[stat]
        #self.log.error("get_latest {0} data={1}".format(stat, data))
        if data:
            return data[-1][1]
        else:
            return 0

    def get_rate(self, daemon_type, daemon_name, stat):
        data = self.get_counter(daemon_type, daemon_name, stat)[stat]

        #self.log.error("get_latest {0} data={1}".format(stat, data))
        if data and len(data) > 1 and data[-1][0] != data[-2][0]:
            return (data[-1][1] - data[-2][1]) / float(data[-1][0] - data[-2][0])
        else:
            return 0

    def handle_fs_status(self, cmd):
        output = ""
        json_output = defaultdict(list)
        output_format = cmd.get('format', 'plain')

        fs_filter = cmd.get('fs', None)

        mds_versions = defaultdict(list)

        fsmap = self.get("fs_map")
        for filesystem in fsmap['filesystems']:
            if fs_filter and filesystem['mdsmap']['fs_name'] != fs_filter:
                continue

            rank_table = PrettyTable(
                ("RANK", "STATE", "MDS", "ACTIVITY", "DNS", "INOS"),
                border=False,
            )
            rank_table.left_padding_width = 0
            rank_table.right_padding_width = 2

            mdsmap = filesystem['mdsmap']

            client_count = 0

            for rank in mdsmap["in"]:
                up = "mds_{0}".format(rank) in mdsmap["up"]
                if up:
                    gid = mdsmap['up']["mds_{0}".format(rank)]
                    info = mdsmap['info']['gid_{0}'.format(gid)]
                    dns = self.get_latest("mds", info['name'], "mds_mem.dn")
                    inos = self.get_latest("mds", info['name'], "mds_mem.ino")

                    if rank == 0:
                        client_count = self.get_latest("mds", info['name'],
                                                       "mds_sessions.session_count")
                    elif client_count == 0:
                        # In case rank 0 was down, look at another rank's
                        # sessionmap to get an indication of clients.
                        client_count = self.get_latest("mds", info['name'],
                                                       "mds_sessions.session_count")

                    laggy = "laggy_since" in info

                    state = info['state'].split(":")[1]
                    if laggy:
                        state += "(laggy)"
                    if state == "active" and not laggy:
                        c_state = mgr_util.colorize(state, mgr_util.GREEN)
                    else:
                        c_state = mgr_util.colorize(state, mgr_util.YELLOW)

                    # Populate based on context of state, e.g. client
                    # ops for an active daemon, replay progress, reconnect
                    # progress
                    activity = ""

                    if state == "active":
                        rate = self.get_rate("mds", info['name'], "mds_server.handle_client_request")
                        if output_format not in ('json', 'json-pretty'):
                            activity = "Reqs: " + mgr_util.format_dimless(rate, 5) + "/s"

                    metadata = self.get_metadata('mds', info['name'])
                    mds_versions[metadata.get('ceph_version', "unknown")].append(info['name'])
                    if output_format in ('json', 'json-pretty'):
                        json_output['mdsmap'].append({
                            'rank': rank,
                            'name': info['name'],
                            'state': state,
                            'rate': rate if state == "active" else "0",
                            'dns': dns,
                            'inos': inos
                        })
                    else:
                        rank_table.add_row([
                            mgr_util.bold(rank.__str__()), c_state, info['name'],
                            activity,
                            mgr_util.format_dimless(dns, 5),
                            mgr_util.format_dimless(inos, 5)
                        ])
                else:
                    if output_format in ('json', 'json-pretty'):
                        json_output['mdsmap'].append({
                            'rank': rank,
                            'state': "failed"
                        })
                    else:
                        rank_table.add_row([
                            rank, "failed", "", "", "", ""
                        ])

            # Find the standby replays
            for gid_str, daemon_info in six.iteritems(mdsmap['info']):
                if daemon_info['state'] != "up:standby-replay":
                    continue

                inos = self.get_latest("mds", daemon_info['name'], "mds_mem.ino")
                dns = self.get_latest("mds", daemon_info['name'], "mds_mem.dn")

                events = self.get_rate("mds", daemon_info['name'], "mds_log.replayed")
                if output_format not in ('json', 'json-pretty'):
                    activity = "Evts: " + mgr_util.format_dimless(events, 5) + "/s"

                metadata = self.get_metadata('mds', daemon_info['name'])
                mds_versions[metadata.get('ceph_version', "unknown")].append(daemon_info['name'])

                if output_format in ('json', 'json-pretty'):
                    json_output['mdsmap'].append({
                        'rank': rank,
                        'name': daemon_info['name'],
                        'state': 'standby-replay',
                        'events': events,
                        'dns': 5,
                        'inos': 5
                    })
                else:
                    rank_table.add_row([
                        "{0}-s".format(daemon_info['rank']), "standby-replay",
                        daemon_info['name'], activity,
                        mgr_util.format_dimless(dns, 5),
                        mgr_util.format_dimless(inos, 5)
                    ])

            df = self.get("df")
            pool_stats = dict([(p['id'], p['stats']) for p in df['pools']])
            osdmap = self.get("osd_map")
            pools = dict([(p['pool'], p) for p in osdmap['pools']])
            metadata_pool_id = mdsmap['metadata_pool']
            data_pool_ids = mdsmap['data_pools']

            pools_table = PrettyTable(["POOL", "TYPE", "USED", "AVAIL"],
                                      border=False)
            pools_table.left_padding_width = 0
            pools_table.right_padding_width = 2
            for pool_id in [metadata_pool_id] + data_pool_ids:
                pool_type = "metadata" if pool_id == metadata_pool_id else "data"
                stats = pool_stats[pool_id]
                
                if output_format in ('json', 'json-pretty'):
                    json_output['pools'].append({
                        'id': pool_id,
                        'name': pools[pool_id]['pool_name'],
                        'type': pool_type,
                        'used': stats['bytes_used'],
                        'avail': stats['max_avail']
                    })
                else:
                    pools_table.add_row([
                        pools[pool_id]['pool_name'], pool_type,
                        mgr_util.format_bytes(stats['bytes_used'], 5),
                        mgr_util.format_bytes(stats['max_avail'], 5)
                    ])
            
            if output_format in ('json', 'json-pretty'):
                json_output['clients'].append({
                    'fs': mdsmap['fs_name'],
                    'clients': client_count,
                })
            else:
                output += "{0} - {1} clients\n".format(
                    mdsmap['fs_name'], client_count)
                output += "=" * len(mdsmap['fs_name']) + "\n"
                output += rank_table.get_string()
                output += "\n" + pools_table.get_string() + "\n"

        if not output and not json_output and fs_filter is not None:
            return errno.EINVAL, "", "Invalid filesystem: " + fs_filter

        standby_table = PrettyTable(["STANDBY MDS"], border=False)
        standby_table.left_padding_width = 0
        standby_table.right_padding_width = 2
        for standby in fsmap['standbys']:
            metadata = self.get_metadata('mds', standby['name'])
            mds_versions[metadata.get('ceph_version', "unknown")].append(standby['name'])

            if output_format in ('json', 'json-pretty'):
                json_output['mdsmap'].append({
                    'name': standby['name'],
                    'state': "standby"
                })
            else:
                standby_table.add_row([standby['name']])

        if output_format not in ('json', 'json-pretty'):
            output += "\n" + standby_table.get_string() + "\n"

        if len(mds_versions) == 1:
            if output_format in ('json', 'json-pretty'):
                json_output['mds_version'] = list(mds_versions)[0]
            else:
                output += "MDS version: {0}".format(list(mds_versions)[0])
        else:
            version_table = PrettyTable(["VERSION", "DAEMONS"],
                                        border=False)
            version_table.left_padding_width = 0
            version_table.right_padding_width = 2
            for version, daemons in six.iteritems(mds_versions):
                if output_format in ('json', 'json-pretty'):
                    json_output['mds_version'].append({
                        'version': version,
                        'daemons': daemons
                    })
                else:
                    version_table.add_row([
                        version,
                        ", ".join(daemons)
                    ])
            if output_format not in ('json', 'json-pretty'):
                output += version_table.get_string() + "\n"

        if output_format == "json":
            return 0, "", json.dumps(json_output, sort_keys=True)
        elif output_format == "json-pretty":
            return 0, "", json.dumps(json_output, sort_keys=True, indent=4, separators=(',', ': '))
        else:
            return 0, output, ""

    def handle_osd_status(self, cmd):
        osd_table = PrettyTable(['ID', 'HOST', 'USED', 'AVAIL', 'WR OPS',
                                 'WR DATA', 'RD OPS', 'RD DATA', 'STATE'],
                                border=False)
        osd_table.align['ID'] = 'r'
        osd_table.align['HOST'] = 'l'
        osd_table.align['USED'] = 'r'
        osd_table.align['AVAIL'] = 'r'
        osd_table.align['WR OPS'] = 'r'
        osd_table.align['WR DATA'] = 'r'
        osd_table.align['RD OPS'] = 'r'
        osd_table.align['RD DATA'] = 'r'
        osd_table.align['STATE'] = 'l'
        osd_table.left_padding_width = 0
        osd_table.right_padding_width = 2
        osdmap = self.get("osd_map")

        filter_osds = set()
        bucket_filter = None
        if 'bucket' in cmd:
            self.log.debug("Filtering to bucket '{0}'".format(cmd['bucket']))
            bucket_filter = cmd['bucket']
            crush = self.get("osd_map_crush")
            found = False
            for bucket in crush['buckets']:
                if fnmatch.fnmatch(bucket['name'], bucket_filter):
                    found = True
                    filter_osds.update([i['id'] for i in bucket['items']])

            if not found:
                msg = "Bucket '{0}' not found".format(bucket_filter)
                return errno.ENOENT, msg, ""

        # Build dict of OSD ID to stats
        osd_stats = dict([(o['osd'], o) for o in self.get("osd_stats")['osd_stats']])

        for osd in osdmap['osds']:
            osd_id = osd['osd']
            if bucket_filter and osd_id not in filter_osds:
                continue

            hostname = ""
            kb_used = 0
            kb_avail = 0

            if osd_id in osd_stats:
                metadata = self.get_metadata('osd', "%s" % osd_id)
                stats = osd_stats[osd_id]
                hostname = metadata['hostname']
                kb_used = stats['kb_used'] * 1024
                kb_avail = stats['kb_avail'] * 1024

            osd_table.add_row([osd_id, hostname,
                               mgr_util.format_bytes(kb_used, 5),
                               mgr_util.format_bytes(kb_avail, 5),
                               mgr_util.format_dimless(self.get_rate("osd", osd_id.__str__(), "osd.op_w") +
                               self.get_rate("osd", osd_id.__str__(), "osd.op_rw"), 5),
                               mgr_util.format_bytes(self.get_rate("osd", osd_id.__str__(), "osd.op_in_bytes"), 5),
                               mgr_util.format_dimless(self.get_rate("osd", osd_id.__str__(), "osd.op_r"), 5),
                               mgr_util.format_bytes(self.get_rate("osd", osd_id.__str__(), "osd.op_out_bytes"), 5),
                               ','.join(osd['state']),
                               ])

        return 0, osd_table.get_string(), ""

    def handle_command(self, inbuf, cmd):
        self.log.error("handle_command")

        if cmd['prefix'] == "fs status":
            return self.handle_fs_status(cmd)
        elif cmd['prefix'] == "osd status":
            return self.handle_osd_status(cmd)
        else:
            # mgr should respect our self.COMMANDS and not call us for
            # any prefix we don't advertise
            raise NotImplementedError(cmd['prefix'])
